JPH0650516A - Incinerator - Google Patents

Abstract

PURPOSE:To make combustion efficient by a method wherein combustion gas on a stoker type fire grating is sucked into the lower part of the fire grating through matters to be incinerated on the substantially central part of the widthwise direction of a furnace. CONSTITUTION:Combustion gas in the upper part of a stoker type fire grating 5 can be sucked into the lower part of the fire grating 5 through matters to be incinerated (refuse) D positioned on the substantially central part in the widthwise direction of the incinerator. Accordingly, the refuse D, thickly piled on the substantially central part of a refuse carrying passage R where the combustion gas passes through, is exposed to the high temperature of the combustion gas and moisture contained in the refuse D is evaporated whereby the refuse D is dried and is brought into readily combustible condition. According to this method, the refuse D can be burnt efficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a stoker-type grate for carrying a burned material along a carrying path of a furnace, and supplies combustion air from below to above the grate. The present invention relates to a refuse incinerator provided with a combustion air supply means for burning the material to be burned on the grate.

[0002]

2. Description of the Related Art This type of refuse incinerator has been constructed so as to supply the combustion air supplied from the combustion air supply means to the range from below the transfer means to the entire surface of the transfer means.

[0003]

However, in the above-mentioned conventional refuse incinerator, the incinerator conveyed by the grate tends to be thicker in the central portion in the width direction of the furnace,
The air required for combustion is easily blown out from both side ends where the dust thickness is thin, and the dust accumulated in the central portion is insufficiently burned, making it difficult to realize high temperature combustion.

In view of the above-mentioned drawbacks, an object of the present invention is to make it easier to burn the dust accumulated in the central portion of the dust transport path and to improve the combustion efficiency.

[0005]

In order to achieve this object, a characteristic structure of a refuse incinerator according to the present invention is that combustion gas above a stoker-type grate for transporting a material to be burned along a transportation path of the furnace. Is provided under the grate for sucking combustion gas through the burned material located substantially in the center of the furnace in the lower direction of the grate.

A combustion gas suction state connecting the suction passage of the combustion gas suction means and a supply passage of the combustion air supply means are connected to the lower portion of the grate located substantially in the center in the width direction of the furnace. A flow path switching unit that can be switched between the combustion air supply state and the combustion air supply state may be provided.

Further, the discharge portion of the high temperature combustion gas sucked by the combustion gas suction means may be arranged on the starting point side of the transport path.

[0008]

According to the characteristic structure of the refuse incinerator of the present invention, the combustion gas suction means sucks the combustion gas above the grate through the burned material located substantially in the center of the furnace in the width direction to the lower side of the grate. The dust accumulated in substantially the central portion of the dust transport path through which the combustion gas passes is exposed to the high temperature of the combustion gas, and the moisture contained in the dust evaporates and dries to burn. It becomes easy.

A combustion gas suction state connecting the suction passage of the combustion gas suction means and a supply passage of the combustion air supply means are connected to the lower portion of the grate located substantially in the center in the width direction of the furnace. If there is a flow path switching means that can be switched between the combustion air supply state and the combustion air supply state, depending on the amount of dust moisture on the grate, the state in which combustion gas is sucked in to dry the dust and the combustion air is supplied It becomes possible to realize efficient dust combustion by arbitrarily switching the combustion state in which dust is burned.

Further, if the discharge portion of the combustion gas sucked by the combustion gas suction means is arranged at the starting point side of the conveying path, the heat of the combustion gas is regenerated in the dust drying step at the starting point side of the conveying path. It can be used and energy saving can be realized.

[0011]

EFFECTS OF THE INVENTION According to the refuse incinerator of the present invention, even if the incineration material conveyed by the grate is thickly deposited in the central part of the grate, the incineration material is accelerated and dried. It has become possible to realize an efficient combustion state.

[0012]

EXAMPLES Examples will be described below.

The refuse incinerator of the embodiment is intended for city refuse D as an example of an incineration object, and as shown in FIG. 2, a combustion chamber 1 for incinerating the introduced refuse D, and its combustion chamber 1. A hopper 3 for temporarily collecting the input dust D to the combustion chamber 1,
It is provided with an ash pit 4 for collecting ash burned in the combustion chamber 1.

A pusher 2 for charging dust D into the combustion chamber 1 little by little is provided under the hopper 3, and the combustion chamber 1 has a drying zone A for drying the dust D charged by the pusher 2. A grate 5 that conveys while agitating it in a conveyance path R that is composed of three regions, a combustion zone B for combustion and a post-combustion zone C for ashing, and blow air toward the center of the grate 5 under the left and right side walls 6 thereof. In order to keep the flame away from the side wall 6 and to cool the side wall 6, there are provided a blowing means 7 and a combustion air supply means 8 for supplying combustion air from below the grate 5.

A waste heat boiler 12 is provided downstream of the flue 9 provided above the combustion chamber 1, and the combustion heat energy generated in the combustion chamber 1 is taken out in the form of steam to generate electricity using a steam turbine. It is used for the energy of the machine 13. further,
The exhaust gas is discharged from the chimney 16 through the white smoke prevention device 15 after the dust and harmful gas are removed by the exhaust gas treatment facility 14 including an electric dust collector and a wet cleaning device.

As shown in FIG. 3, the grate 5 has a fixed grate 5a mounted on a fixed frame F1 and
The movable grate 5b is attached to the movable frame F2 by the fixed grate 5.
The movable frame F2 is mounted so as to be alternately arranged in the transport direction with respect to a, and the movable frame F2 is swingable by the reciprocating operation of the hydraulic cylinder S.
It is configured to be reciprocally driven in an obliquely vertical direction with respect to the fixed frame F1 via the.

As shown in FIG. 1, the space G below the grate 5 is in communication with the combustion air supply means 8, and in the space g below the combustion zone B, Combustion gas suction means 19 is provided for sucking the combustion gas above the grate 5 through the dust D located substantially in the center of the conveyance path R in the width direction to the lower side of the grate 5. Further, in the space g, a combustion gas suction state in which the suction passage 19a of the combustion gas suction means 19 is connected to the lower side of the grate 5 located substantially in the center in the width direction of the transport passage R, and a combustion air supply A flow passage switching means 20 is provided which can be switched between the combustion air supply state in which the supply passage 8a of the means 8 is connected.

The flow path switching means 20 has a transport path R at one end.
Partition walls that communicate with the grate 5 and the upper space thereof located substantially in the center in the width direction of the fuel cell, and that form the induction space with the other end communicating with the combustion air supply means 8 or the combustion gas suction means 19. It comprises a part 20a and a damper part 20b at the other end of the guiding space, which is selectively communicatively switchable to the combustion air supply means 8 or the combustion gas suction means 19.

The discharge portion 19b for the high temperature combustion gas sucked by the combustion gas suction means 19 is, as shown in FIG.
It is arranged in the space G below the dry zone A on the starting point side of the transport path R.

According to the refuse incinerator of this embodiment, the transport path R is
The flow path switching means 20 is arbitrarily switched according to the combustion state of the dust D that conveys the dust D, and the dust D located substantially in the center of the width of the transport path R is not only burned normally but also dried and burned. It is possible to reduce the time required to incinerate the waste and improve the incineration efficiency.

[Other Embodiment] Another embodiment will be described below.

<1> The flow path switching means 20 is not limited to the one having the configuration described in the above embodiment,
For example, if the separation distance of the partition wall portion 20a is changeable, the range of the dust D through which the combustion gas above the grate 5 sucked by the combustion gas suction means 19 passes can be changed. , It becomes possible to control the dust burning with finer grain. Further, the switching of the flow paths may be performed by a configuration other than the damper.

<2> Further, if a flow path switching means moving mechanism that can change the suction point in the transport path R is provided, for example, a combustion state detector such as a temperature sensor provided on the grate 5 can be provided. By combining them, it is possible to realize waste combustion with less waste.

<3> Further, the combustion gas suction means 19
The discharge portion 19b of the discharge passage 19b is not limited to being arranged in the dry zone A on the starting end side of the transport path R, and may be configured to discharge to the outside of the combustion chamber 1, and the flue 9 of the combustion chamber 1 and the left and right sidewalls. It may be arranged in the ventilation passage 6 or the like.

It should be noted that reference numerals are added to the claims for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a schematic side sectional view showing a combustion zone of a refuse incinerator of an embodiment.

FIG. 2 is a schematic configuration diagram of a refuse incinerator according to an embodiment.

FIG. 3 is a perspective view showing a grate according to an embodiment.

[Explanation of symbols]

 5 Grate 8 Combustion air supply means 8a Supply path 19 Combustion gas suction means 19a Suction path 19b Discharge part 20 Flow path switching means D Burned material R Transport path

Claims (3)

[Claims] 1. A stoker-type grate (5) is provided for carrying a burned material (D) along a carrying path (R) of a furnace,
Dust provided with combustion air supply means (8) for supplying combustion air from below to above the grate (5) to burn the burned material (D) on the grate (5). Combustion gas for inhaling combustion gas above the grate (5) downward through the grate (5) through the burned material (D) located substantially in the center in the width direction of the furnace. Suction means (19)
A refuse incinerator provided under the grate (5). 2. A combustion gas suction state in which a suction passage (19a) of the combustion gas suction means (19) is connected to the lower portion of the grate (5) located substantially in the center in the width direction of the furnace and the combustion gas. Flow path switching means (2) that can be switched to the combustion air supply state in which the supply path (8a) of the air supply means (8) is connected.
0) is provided, the refuse incinerator according to claim 1. 3. The discharge part (19b) for the high temperature combustion gas sucked by the combustion gas suction means (19) is arranged on the starting point side of the transport path (R). Garbage incinerator.